File:Cedar of Lebanon cone.JPG|thumb|right|150px|Cedar of Lebanon cone showing flecks of resin as used in the mummification of Pharaoh|Egyptian Pharaohs.
File:Resin with insect (aka).jpg|thumb|200px|right|Insect trapped in resin
In polymer chemistry
and materials science
, '''resin''' is a "solid or highly viscous substance, usually containing prepolymers with reactive groups."
Such viscous substances can be plant derived or synthetic.